I am 52 and I have never heard an explanation by priests or the Catholic Church as to who or what the Holy Spirit is?
Have you? Please educate me.
Spruce
First of all, the English language is Not very comprehensive, and the Bible was mostly written in the comprehensive Hebrew language.
In English we use the word spirit in different ways:
Besides using spirit in connection to angels, ghosts or spooks we can think of pep rallies designed to create lively school spirit. Or we can think of a lively high-spirited horse.
We don't think of spirits as filling a person [ unless perhaps it's 100 proof ]
Those at Acts 2 v 4 will filled with God's holy spirit. Not filled with a person.
Even Noah Webster replaced the word ghost with the word spirit because spirit does Not mean an apparition.
Unlike God and Jesus always in the masculine sense, God's spirit is: neuter.
Please notice Numbers 11 vs 17and 25 [KJV ] uses the neuter word ' it '.
God's spirit is a force or energy that God uses as He put His spirit upon them.
- Psalm 104 v 30
KJV also uses the word ' itself ' in connection to God's spirit at Romans 8 vs 16,26
In Greek grammar rules it is proper to address the masculine although a neuter.
Even in English we can call a neuter ship or car addressed as ' she' although neuter.
So, God's spirit is His active force to accomplish things - Psalm 104 v 30
We don't see invisible wind but we can see what wind accomplishes.
God's invisible spirit helps Christians accomplish the spreading of the good news of God's kingdom to the ends of the earth - Acts 1 v 8; Matthew 24 v 14